@function rem($px) {
  @return $px / 46.875 + rem;
}
*{
  margin: 0;
  padding: 0;
}
body{
  display: flex;
  background-color: #AFD3F7;
  overflow: hidden;
}
header{
  z-index: 2;
  position: fixed;
  top: 0;
  width: 100%;
  height:rem(160);
  background-color: deepskyblue;
  .imgBox{
    text-align: center;
    color: white;
    font-size: rem(45);
    line-height: rem(130);
    width: 100%;
    height: 100%;
    background-image: url('../images/title_bg.png');
    background-size: 100% rem(160);
    a{
      padding-left: rem(10);
      width: rem(30);
      height:rem(50);
      display: inline-block;
      position: absolute;
      top:rem(40);
      left: rem(20);
      background-color: transparent;
      background-image: url('../images/back.png');
      -webkit-background-size:rem(40) rem(50);
    }
  }
}